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Method for producing polypropylene-based resin foamed blow-molded article

A technology of polypropylene-based resin and manufacturing method, which is applied in the field of manufacturing polypropylene-based resin foamed blow-molded objects, and can solve the problem of reduced foamability and blow-molding performance of foamed blanks, and difficulty in obtaining foamed blow-molded products with thickness accuracy. It is difficult to obtain the expansion ratio and other problems of plastic molding, and achieve the effect of excellent uniformity of wall thickness

Active Publication Date: 2012-12-12
JSP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the foamability and blow moldability of the foamed material tend to decrease, and it tends to be difficult to obtain a desired expansion ratio, and it also tends to be difficult to obtain a foamed blow molded product with high thickness accuracy.

Method used

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  • Method for producing polypropylene-based resin foamed blow-molded article
  • Method for producing polypropylene-based resin foamed blow-molded article
  • Method for producing polypropylene-based resin foamed blow-molded article

Examples

Experimental program
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Effect test

Embodiment 1

[0131] Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

[0132] Tables 1 to 3 show the types and physical properties of polypropylene-based resins used in Examples and Comparative Examples. In addition, the storage elastic modulus G' when the angular frequency of the polypropylene resin is 100 rad / sec, the slope of the storage elastic modulus G' when the angular frequency is between 1 and 100 rad / sec, and the loss when the angular frequency is 1 rad / sec Tangent tan δ, melt tension (MT) and melt flow rate (MFR) at 230° C. were measured according to the methods described above.

[0133]

[0134]

Embodiment 1～6、 comparative example 1～8

[0135] Examples 1-6, Comparative Examples 1-8, Reference Example 1

[0136] The types and compounding amounts of polypropylene-based resins shown in Table 4 and talc as a cell regulator were supplied to an extruder with a diameter of 65 mm, and melted and kneaded in the extruder. Next, carbon dioxide (CO 2 ) by pressing and mixing so that the injection amount (mol / kg) shown in Table 4 per 1 kg of polypropylene-based resin was obtained to prepare a foamable molten resin. Next, an expandable molten resin is filled into an accumulator connected to the extruder. Then, the foamable molten resin was extruded and foamed in the normal-pressure region through the annular die arranged at the front end of the pressure accumulator to form a foamed billet. Next, while blowing pre-blowing gas into the foamed billet, the foamed billet is sandwiched between the two combined metal molds arranged directly below the die, and blown into the foamed billet from the blowing rod. The plastic gas i...

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Abstract

Provided is a method for producing a polypropylene-based resin foamed blow-molded article whereby a molded article, which has improved foaming properties and improved blow-moldability of a foamed parison, compared with articles obtained by the existing production methods, and shows a high uniformity of wall thickness over a wide range of density, can be obtained. The method for producing a polypropylene-based resin foamed blow-molded article, which comprises kneading a polypropylene-based resin with a physical foaming agent, extruding the thus obtained foamable resin melt through a die to give a soft foamed parison, inserting the foamed parison in a mold and then blow-molding the same, is characterized in that said polypropylene-based resin comprises a polypropylene-based resin (A) satisfying specific requirements (1) to (3) and a polypropylene-based resin (B) satisfying a specific requirement (4), each in measuring dynamic viscoelasticity imparting a vibration strain at 190 DEG C, and the mixing ratio by weight (A:B) of the resin (A) to the resin (B) is in the range of 100:0.5 to 100:5.

Description

technical field [0001] The present invention relates to a method for producing a polypropylene-based resin foam blow molded article. Background technique [0002] Conventionally, blow molding techniques have been used to develop foamed blow molded articles having a foam layer. Various methods have been proposed as a method for producing foamed blow-molded articles, such as melting and mixing the foaming agent and the base material resin through an extruder, extruding it through a die to form a foamed billet, and forming a foamed billet with a metal mold. A method in which the foamed blank is sandwiched and blow-molded. [0003] The foamed blow molded article obtained as described above is excellent in heat insulation, light weight, etc., and can be used in applications requiring these properties, such as automotive parts, containers, pipes, and electrical and chemical parts. Among them, hollow foam blow molded articles using polypropylene-based resins as base resins are ex...

Claims

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Application Information

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IPC IPC(8): B29C49/04C08J9/12C08L23/10B29K105/04
CPCB29C2791/006B29K2023/10B29C49/0005C08K3/34B29C49/22C08J2323/12C08J9/14B29C49/04B29C2791/007B29K2105/04C08L23/10C08L2205/02C08L2666/06C08J9/12B29C44/02B29K2023/12
Inventor 常盘知生五味渕正浩
Owner JSP CORP
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